Furnace



,UNrrsD STA-Tes PATENT @errent yECKLEY B. GOXE, OF DRIFTON,PENNSYLVANIA.

FURNACE.,

'SPECIFICATION forming part of Letters atent N o. 518,578, dated April1'?, 1894. .Application iiledNovemher 27, 1893. Serial No. 492,083.. (Nomodell) To all whomz't may concern: a', b', c', d', respectively, fromthe air-supply VRe it known that-I, ECKLEY B. COXE, aciticonduit orair-pipe, 2; which conduit, when een of the United States, residing atDritten, used,is in'communication with some suitable 55 fln the ,countyof Luzerne and' State of Penn-l pressure-blast mechanism or apparatus,as, 5 sylvania, have invented certain' new and use' for instance, thefan-blower, N; this blowerful Improvements in Furnaces, of'which 4themay be `actuated by connection with some lfollovving is a specification.y Y suitable source of power, as, for instance, This invention relatesto furnaces, and is by the connectingdriving-belt,`3, running 6o n thenature of an improvement on the in- -over the driving-pulley, 4,` en arevolving lo Vention described and claimed in Letters line-shaft-, 6.Said air-supply mechanism, Patent of the United States No. 499,716," orblower, being in operation at the proper granted to'rneJune 20,18935andmypresent speed for supplying the highestpressure improvements areherein shown in connecair-blast required, the other air-blasts are tionwith the multi-blast traveling-grate furreduced to the requiredpressures, respectl g 5 nace described in'said patent. i ively, by meansof the several'air-valves de- The object of my present invention is .tescribed. .In practice, o'nly amoderate airprov'ide on organization ofmechanism or ap-` Y pressure is used in the first air-blast appa.-paratus whereby, in a furnace-plant of the ratus'ct, the pressure herebeing made suit- A7e class described, the plenum of air in the furablefor ignition of the fuel'when this rst zo nace-chamber normally due tothe high-press enters the furnace-chamberat the forward urel air-blastmay be controlled to prevent the end thereof, which is at the right-handin the re-action thereof upon the successive low-v drawing. The second.air-blast apparatusb.

pressure air-blast or blasts, for the purpose is .usually the one whichis supplied with air ofmak-ing moreuniform the operation of the at themaximum pressure, in practice and z5 steam-plautand permitting the-useofalower especially` when burning small-size anthrapressure air-blast.with more `uniform results cite, this pressure is usually equal toone-inch during* the later stages of the combustion orone and'one-halfinches of water. AIn the period; VAalso to provide Vmeansfor obtainingnext air-chamber c, the 4pressure is reduced 8o the required variableair-supplies without the to about two-thirds,or even to one-half, of the3c use of a pressure-blast apparatus.A pressure inthe chamber b; `whilein the last In the drawing'is shown, in sectional side chamber of theseries-itis reduced to a much elevation, 4a furnace-plant embodying mylower point, frequently notl exceeding the presentimprovemnts. fpressure of one-fourth o f aninch of water. 85 The furnaceshownin-thedrawingis ormay `It will be,` understood that, 'in any case,by 35 be the same as the furnace described in my pressure as applieitoan air-supply, is l afOI'eSaid prior Letters Patong/and which .meantthepressure o f the same incompari-- consists of the usual wallsinclosing the furson with pressure Withinthe furnace-chamnace-chamber C;a fuel-conveying' grate, G, ber; and that whether this pressure be above`9e provided with' means" (substantially asgdelor below that of theatmosphere is not mao scribed in said patent) `for actuating the terial.L grate; y means, as, for instance, the hopper H, The tendency ofthehigh-pressure air in the for supplying fuel to the upperrnn of saidair-blastfromthe-chambel-b naturallytendsto conveyor-grate; a series ofvariable-pressure createasurplus or over-,pressurein thenearlyslr-supplyapparatuses, designated by a, Inc, closed' furnace-chamber, thus causinga red, respectively, and located underneath the lacting back-pressure ofsutiicient magnitude fuel-conveying furnace-Hoor, as indicated in toovercome the inlinx ot' the lower pressure `the drawing; and, means forsupplying said airblasts,and thereby detroy their efficiency;

` air-supply apparatuses or chambers a, b, ad, that action also makeslthe lowest-pressure zoo respectively, with air at the requiredpressair-blasts variable in effect. To overcome i 5o ures. Themeasforcontrolling the successthis objection I have provided, inconnection ive airsupplies consists or may consist of the with thedischarge-end of the furnace-charnregulating valves a, b, c7211, in thepipes ber,an exhaust apparatus adapted for reduc ing the air within thefurnace-chamberto a Vafter these have been used. The exhaust apparatus,in the form thereof herein shown consists of a, blast-nozzle, 7, V(whichwill usually be a ksteam blast nozzle) located in the stack or liuc atsome suitable point in or beyond the outlet` of the furnace-chamber.This b1ast-nozzle 7 is suppliedV with steam from asuitable steam supply,as, for instance, the steam-boiler which is shown in connection with thefurnace. In the drawing, the steam nozzle 7 is shown centrally disposedwithin yand somewhat below the contracting-A rng 8 of the stack. Thenozzle is supplied through the pipe 9 in which isa valve, 10, forregulating the supply of steam tosaid nozzle. In practice, this valvewill require regulation in connectionwith the regulating air-valves a,b, c,d", so as to properly adjust the exhaust-blast toene or more of the'several air-blasts.

In operation, the ejectionof steam from the blast-nozzle 7 creates asuction in the furnace-chamber sufficient to' carry off the surplusairand secure the requisite result in the reduction ofair-pressuretherein', thus ohviating reacting back-pressure.

By the construction and organization of apparatus as herein described,the fuel, in a layer upon the furnace-floor, is subjected from below tothe action of successive airblasts ofvarying pressures, and theresultant air-pressure created in the furnace-chamber by the higherpressure blast ofA the successive air-blasts is reduced by suction so asto have no counter-acting eect upon the lower-pressure air-blast whichwould otherwisedestroy the efficiency.

Having thus described my invention, I

claim-7n In a furnace of the class specified, the combination with thefurnacechamber and its nclosing walls, and with the furnace-floorlocated under said chamber,of high-pressure and low-pressure airblastapparatus located below and in communication `with the furnace-floor,and a blast-apparatus located near the discharge-end of thefurnace-chamber and adapted for reducing the absolute airpressure insaid chamber to a pressure below xthat of the lowest-pressure air-blastapparatus, to prevent re-acting backfpressure, substantially asdescribed and for the purpose set forth.

'IECKLEY B. ooXEk.

Witnesses:

Louis OBTNER, STEWART F. MACFARLANE.

